Instead of baggy trousers and outsize shoes, there are leggings and high heels. All that is left of the traditional Ronald, who made his debut 42 years ago, are the muted stripes and red and yellow livery in which the new model is draped.

Disturbingly for the all-American Ronald, websites are speculating as to whether the lady in question is actually a cross-dressing “metrosexual” male.

Beacon Communications, the Japanese agency behind the McMakeover, said that the red, white and yellow colours were so distinctive that it was these that now defined the brand rather than Ronald himself.

Faced with growing concerns over obesity and the negative portrayal of its products in the film SuperSize Me, McDonald’s has questioned whether even its famous Golden Arches have become a liability.

Although the 30,000 restaurants generated £13 billion last year, stronger revenues in the US have offset weak sales in Japan, Britain and Germany.

Strategists at the Illinois-based company, which celebrated its 50th birthday this year, blamed the laughing clown. First, Ronald McDonald was put on a diet for a campaign aimed at mothers and young adults to rebrand the company as a provider of fruit, vegetables and healthy meals.

A slimmer Ronald donned a (yellow and red) tracksuit for a global advertising campaign in which he urged children to take up snowboarding and other active pursuits. He juggles vegetables in one advert, in which hamburgers are nowhere to be seen, and joins in synchronised swimming.

The tennis stars Serena and Venus Williams were signed up for a campaign promoting healthier living, and the pop stars Destiny’s Child and Justin Timberlake also became public faces of the brand.

The Japanese campaign has been credited with returning customers to McDonald’s outlets and won praise from designers and fashion experts.

But the gender switch is deemed too radical a change for a global audience and the clown Ronald, albeit slimmer, is not being retired.

McDonald’s has had a rocky relationship with Japan since its arrival in 1971. Faced with accusations that hamburgers were inimical to the country’s diet, Den Fujita, the first McDonald’s Japan president, declared: “The reason Japanese people are so short and have yellow skins is because they have eaten nothing but fish and rice for 2,000 years. If we eat McDonald’s hamburgers and potatoes for a thousand years we will become taller, our skin become white and our hair blond.”

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